Preparation Of Oxygen Electrode In Lithium/Air Batteries And Its Oxygen Reduction Performance Research

Li/air batteries are receiving wide attentions for applications in electric vehicles and many other advanced electronic devices due to their high theoretical energy density. If successfully developed, this battery could provide an energy source for electric vehicles rivaling that of gasoline in terms of usable energy density. However, there are numerous scientific and technical challenges that must be overcome if this alluring promise is to turn into reality. The cathode reaction of the lithium/air battery is a three phase reaction including gas, liquid and solid, thus the requirement of air electrode is extremely high. In this paper, our research focuses on the preparation of oxygen electrode and it’s oxygen reduction performance study. The main contenta are as follows:1. Graphene electrode was prepared by electrophoretic deposition using graphene suspension with aniline hydrochloride as electrolyte. The morphology and structure were characterized through TEM, SEM and Raman. The catalytic behavior during oxygen reduction was studied by CVand RDE in alkaline medium.2. Graphene-silver electrode was prepared by electrophoretic deposition using graphene suspension with silver nitrate as electrolyte. The morphology and structure were characterized through TEM, SEM, XRD, EDS and Raman. The catalytic behavior during oxygen reduction was studied by CVand RDE in alkaline medium. We find that the G+Ag electrode exhibited higher electrocatalytic activity then bulk Ag electrode.The oxygen reduction current density was-5.26mAcm-2, the onset potential was-0.092V, and the electron numbers was approach4. Mechanism study revealed that G+Ag electrode has less influence then Ag electrode by hydroxyl adsorption.3. Graphene oxide-silver electrode was prepared by electrophoretic deposition using graphene oxide suspension with silver nitrate as electrolyte. The morphology and structure were characterized through AFM, SEM, XRD, EDS and Raman. The catalytic behavior during oxygen reduction was studied by CVand RDE in alkaline medium. The oxygen reduction current density was-8.90mAcm-2, the onset potential was-0.069V, and the electron numbers was approach4.